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BENJAMIN lli-VING, OF NEW YQ HK, N. Y?4

Leiters Patmzt BTO. 64,324, flaefZiAprI. 1367."

:tient @fitta IMPROVBD APPARATUS FOR GONGENTRATIG THE EXTBACT 0F BARK FOB. TANNING AND- OTHER PURPOSES.

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TO 'ALL WHOM IT MAY CONOERN':

'Be it known that I, BENJAMIN IRYIXG, of the city, county, and State of New York, have invented certain new and useful improvements in Apparatus for Concentrating lthe vExtracts from Barkffor-Tanning and Other Purposes; and I do hereby declare that the following is a. full description of the same.'

'lho nature of my invention consists -in constructing a; ilat'worm for distillin'g purposes, with corrugated plates, whereby is obtained an extensively diffused radiating surface to evaporate `the liquids passing through the worm and the second wart of mv invention consists in eom'binino' with a flat worm made from corru ated 7 l c f o g plates a steam box or chamber, whereby the operation of' eraporating the extract may be carried on; and the third part of my invention consists in combining with a Vflat worm made from corrugated Yplates one or more air-tight receiving-tanks for the purpose of 'obtaining a vacuum in the worni to cause it to beself-feeding and self-discharging, and at the same time carrying off thc` watery vapors ofthe extract as disengaged-*from lit while passing through the worm.

But to describe my invent-ion more particularly, I will refer to the accompanying drawings, forming a partof this specification, the saine letters of reference whenever .they occur referring to like parts.

Figure 1 is a perspective view of the apparatus. A Figure 2 is a longitudinal cut section ofthe ilat worm through the line fc l', tig. Si. Figure is a transverse eut section of the same through the line :ci as?, fig. 2. Figure 4 is a side View of the flat worm, as arranged between side plates. Figure 5 is an end View of the ilat worm through the lineair", fig. 4. Letter A represents a steam chamber or box, elevated upon a bed-plate or frame, B. In the steam chamber is arranged a flat worin, C, of one or more feet in width, and of any length deemed necessary for evaporating the iiquids passing through the worm. The upper and lowersides ofthe worm are formed of corrugated plates. The object of this-is to obtain, first, a greater amount of radiating surface in the worm than would be possible by any other-'conformation of it; second, to obtain a thin stratum of the liquid in the worm of varying depths, according to the depthsv of the lcorrugations'in the plates, and thus expedite thcelimination 'of the watery pau-rticles of the extract, to obtain a. rapid concentration of it; third, to obtain the greatest amount of strength to sustain the pressure upon their broadA surfaces while the evaporationis going on. To the upper end of the worm is attached a feed pipe, D, the end of which is inserted intothc head of the worm so as to extend across it,

. and thus, by means of a vseries of holes in it, diffuse the liquid in a spray over vthe entire surface of the upper portion of the worm. 'lhe ylower end of this feed pipe'is'carried through an exhaust or condensing steam chamber, E, in which a portion of it is formed into a coil for the purpose of taking up the heatof the condensed steam, and thus be partially heat-ed'before being discharged into the worm, whilst the end of it thence passes out at the opposite side of the condenser, to connect with and supply' the reservoir. Also connected with the upper end of the worm is a pipe, F, for carrying otf the watery vapor eliminated from the extract in passing through the worm, the out-cr or lower end of which is joined upon a pipe, G, connecting two air-tight receiving tanks, H and I, together. To the backside of these tanks is another connecting pipe, J, from about the middle of which projects another pipe, K, to form a connection with the lower end of the worm, to carry oi` the concentrated extract from tlie worm to the tanks. These operations are effected by applying any suitable exhausting apparatus'to the pipe L vand obtaining a. vacuum in the tanks. By this means a vacuum is produced inthe worm, causing thereby the liquid extract to ilow into it through the supply or feed pipeD, and at the same time flow rapidly through it and -out by the pipes K and tothe tanks, whilst thewatery vapor as fast as liberated from the extract in the worin is carried oftt by thc exhausting.apparatus foil'przoduclng a vacuum in the tanks. 'lo the lower ends of these tanks are fauccts,-M, for drawing oil' the concentrated extract, when required. lo facilitate this operation faucets, N, are placed in the pipes G and J, so that when drawing oil' from one tank the vacuum in the other may remain, and thus keep up t-he continuous operations of the worm. Letter P is a.v

steam pipe attached to the back of the steam chamber for the admission of steam to heat up the rrorinto carry on the operation of concentrating theA extract. To facilitate the circulation of the steam in the chamber and about the worm, holes are punctured in the sides platesof it, between the coils thereof. In practical operations,

however, this will not be necessary, as the worm will be made of a skeleton form, and thus be open on all sides for the free circulation of the steam. Letten B. is a. pipe attached to the lower part of the steam chamber, for carrying olf any condensed waste water in it, and S a gauge or safety-valve to indicate the pressure of steam used for condensing the extract.

Having new described my invention, I will proceed to set forth what I claim, and desire to secure by Letters Patent of the United States:

1. I claim the use of a flat worm made of corrugated sheets o1' plates of metal, substantially" as hereinbef'ore `set forth, and for the purposes described.

2. I-also claim, in combination with a'lat Worm, made snbstantinllv'Y as hereinbefole described, a steam chamber or box, for the purposes set forth. l

3. I also claim the use of one o1' more tanks H and I, in combination with connecting:r pipes G nml J and exhausting pipe L, arranged and operating substantially as hei'enbefore set fovth.

4. I also claim the combination of the flat Worm, made as liei'einbefoie described, with one or more tanks HA and I, by means of the pipes F and Ii, for the purposes liereinbefore set forth. l v

i BENJAMIN IRVINU. Witnesses C. L. BARRITT.

J. H. Monson. 

